imens that are millions of years old. To find these signatures, researchers run samples of tooth enamel th▓rough a mass spectrometer.DeSantis and her collaborat▓ors analyzed enamel samples from 115fossil teeth.
For two o▓f the specimens she took serial samples, small samples t▓hat run perpendicular to the growth axis and give insight ▓into how the d
iet and climate changed over a specifi▓c period of time."That's one of the cool things about using▓ mammal
ago.▓"The study highlights the importance of the fossil record in understanding long-term ecological resp
onses to changes over time, DeSantis said. While ecological studies of modern impacts can cover only lim